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Well, I'll say that a possible workaround is to first look for the the first paragraph, then save it in an array and finally do the grep

If the grep returns nothing, then proceed to fill the array...

Hope this helps, I created a file prodtest for example

$ perl -pe 'if ( $_ =~ /hostname/ ) { s/test/prod/ }' prodtest

st oa_var="s_hostname">prod</host>
<host oa_var="s_name">test</host>...

First list the 6 thousand files in one column, then pipe the output to xargs, telling xargs to execute perl for each file, {} is where xargs with the -i option puts the input file.
the -i.org is for...